Acid resisting laminated product



Aug. 23, 1938. G. H. MAINS ACID REsIs'nNG LAMINATED PRODUCT Filed larch 15, 1934 INVENTOR WITNESSES Patented Aug. 23, 1938 UNITED STATES 2,128,097. ACID RESISTING LAMINATED PRODUCT Gerald 1H. Mains. Muri-ysville, Pm, asslgnor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa a corporation oi Pennsylvania Application March 15, 1934, Serial No..7l5,6l1

4 Claims. (01. 117-2125) and thereby greatly weaken the vessels and other apparatus. Other materials have been tried in place of cellulosic materials but the same weakll ness results.

-Thc-obiect of the invention is to provides molded laminated product which will not deteriorate when exposed to acids.

It is also an object of the invention ,to introduce a method of working acid resisting materials to make molded laminated products.

, The invention accordingly comprises the several steps and the relation and order of one or more or such steps with respect to each of the others 25 and the article'possessing the features, properties and relation of elements which are exemplitied in the following detailed disclosure and the scope of the application of which will be indicated in the claims.

30 For a fuller understandingof the-nature and objects of the invention, reference should be had to the following detailed description taken in con:

nection with the accompanying drawing, in

which: Y

5 Figure l is a top plan view and end elevation of a fabric wovenin accordance with the teachings of this invention, i

Fig. 2 is a view in side elevation'of a press showing, the manner 01' applying heat and pressure to 40 the assembled composite body,

Fig. 3 is a view in side elevation of a product or plate fabricated according to the teachings of this invention,

. Fig. 4 is a view in cross-section of a spinning 45 bowl suitable for such industries as the artificial silk industry, manufactured in accordance-with It has been found that by mixing a predetermined amount of an organic fibrous material such as wool, silk or a fibrous cellulosic material with the blue asbestos that it may bewoven into a fabric which possesses sufficient flexibility and ii strength to withstand the operations involved in impregnating and molding the material to the desired shape to produce vessels and apparatus suitable for the industries. This mixture of blue asbestos and cellulose may be woven into fabrics 1d of suitable weights to iacilitate impregnation and molding. Fabrics ranging from 12 to 24 ounces per square yard have been woven, impregnated and molded with success. v

In making fabrics which are suitable for mold- 15 ing operations, good results have been obtained by mixing from 5% to by weight, oi. 9. iibrouscellulosic material such as cotton with from 95% to 80%, by weight, of blue or African asbestos. .When a mixture of this kind is made, it 20 may be spun into yarn which may be woven into a fabric such as'iliustrated at it in Fig. l. The cotton fibers give the fabric ill suificient strength to withstand the operatlonsiuvolved in lrnpreg= noting it with a binder and molding it to a predetermined shape. i

When the fabric has been prepared it is passed through a solution of some suitable binder such for example as a phenolic or other synthetic resin. The number of times that the fabric is passed through the binder will depend on the conditions to be met. The method of impregnatingfabrics by drawing or passing them through solutions of binders is well known inthe art. The impregnated fabric is then dried and cut into blanks oi the desired sizes and shapes. If the product thatls" to be made is a plate, a predetermined number of blanks or layers ii of the fabric will be superimposed on one another and subjected to heatand pressure between the mold- 0 ing plates i2 and. i3 oi the hydraulically operated press illustrateddiagrammatically in Fig. 2.

After heat and pressure'have been applied for a predetermined time in accordance with the practice-in the art, a finished plate such as I will be produced. If a spinning bucket such as illustrated at ii in Fig. 4 is desired, the impregnated. superimposed fabrics will he introduced vinyl resins and other thermosetting and thermog ill ' SUCCEEE.

When vessels, pistes end-the like mzule in this manner, are subjected to acids such es sulphuric acids, the celiulosic material will be gradually attacked and caused to deteriorate. However, ii; hes been found that there is present such e small proportion of the celluloslc' materiel izhst even if it is pcrtly or wholly destroyed, the Vessel or apparatus thus fabrics-led from line blue asbestos one e binder will have sufficient strength for most.

purposes for which such vessels or apparatus ere utilized. In some instances, articles of manufacture such as spinning buckets for the artificial silk inclustry such as illustrated in Fig. 5 and many other articles may be fabricated by molding a mixture of a pulverized solid resin and an acid resistant asbestos with inserts l5 and reenforcing members ll embodied therein. The inserts l6 and reeniorcing members will be located at points where ii: is desired to increase the strength of the article.

This method for-some purposes may result in s. more economical structure.

The results obtained in this manner arehighly satisfactory and are of great commercial value.

Since certain changes in carrying out the above processes and certain modifications in the article which embody the invention, may be made without departing from its scope, it is intended that all mattercontained in the above description or shown in 'the' accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

nieces? I claim es my invention:

1. An acid resistant spinning bucket comprisinc 9. plurality of layers of a mixture of an orsonic fibrous material and an acid resistant es cestos woven into a fabric, the organic fibrous material being present only in suficient quantitles to enable the weaving oi the mixture and e. resctecl ecisl resistant binder iuipregncislng the lsyers oi the fabric and binding ii: into a. spinning bucket of predetermined shape, she asbestos being presentln quantity suficient to give the elesireli strength to the spinning bucket when the organic fibrous materials have been destroyed by on acid.

2. A molded laminated spinning bucket comprising a plurality of layers of fabric, the .fcbric consisting of a. minor proportion of an organic fibrous material and cmajor proportion of an acid resistant asbestos and an acid resistant binder uniting the layers of fabric.

1 3. A molded laminated spinning bucket comprising a plurality of layers of fabric, the fabric consisting of a. mixture of from 5% to 20%, byv 

